Device for solving color difference in electrolytic copper foil production process

Abstract

The utility model relates to the technical field of anti-oxidation treatment of copper foils in the production of electrolytic copper foils, and discloses a device for solving chromatic aberration in the production process of the electrolytic copper foils, which comprises an anti-oxidation tank, a liquid squeezing roller, and a tank inlet roller, two submerged rollers, a tank outlet roller and a wind-up roller which are sequentially arranged along the transmission direction of the copper foils, the groove inlet roller is higher than the two submerged rollers, the groove outlet roller and the wind-up roller, and the liquid squeezing roller is matched with the submerged roller, close to the groove outlet roller, of the two submerged rollers and squeezes copper foil on the submerged roller. Two air knives are fixedly arranged between the groove outlet roller and the submerged roller located at the lower end of the groove outlet roller, and air outlets of the two air knives are opposite and located on the two sides of the copper foil respectively. And heating rods are installed on the two sides of the bottom end face in the anti-oxidation tank, and magnetic anti-corrosion stirrers are installed at the four corners and the positions close to the middle point of the bottom end face of the inner wall of the anti-oxidation tank. According to the utility model, the anti-oxidation liquid can be uniformly plated on the foil surface, so that no anti-oxidation chromatic aberration is ensured.

Description

Technical Field

[0001] This utility model relates to the field of anti-oxidation treatment process for copper foil in the production of electrolytic copper foil, and in particular to a device for solving the color difference that occurs in the production process of electrolytic copper foil. Background Technology

[0002] Electrolytic copper foil plays a crucial role in the fields of new energy and electronic information as a key component in lithium-ion batteries, printed circuit boards, and chip packaging substrates. With the development of integrated circuits towards higher density, multilayering, and thinner profiles, and the pursuit of high energy density and lightweight in lithium batteries, the performance requirements for electrolytic copper foil are becoming increasingly stringent. It not only needs to be thinner but also requires properties such as high tensile strength.

[0003] The current production process of electrolytic copper foil faces numerous challenges. While the manufacturing process of electrolytic copper foil appears simple, mainly involving three steps—solution foil production, surface treatment, and product slitting—it is actually a highly integrated process of electronics, mechanics, and electrochemistry, and requires extremely stringent environmental conditions. Currently, the industry lacks standardized and universally applicable production equipment and technologies, which has become a significant bottleneck restricting the improvement of domestic electrolytic copper foil production capacity and quality.

[0004] Among these issues, color difference in electrolytic copper foil is particularly prominent. Due to various complex reasons, the surface of copper foil is prone to chemical reactions, resulting in a surface layer of yellow, blue, red, black, or a mixture of colors, thus exhibiting color difference. For example, horizontal or vertical oxidation streaks appear on the copper foil surface; acid streaks are formed by corrosion from sulfuric acid solutions or electrolytes; water streaks are caused by uneven washing; circular oxidation marks (acid rims, water rims) are formed by the accumulation of electrolyte or water on the copper foil; acid mist spots are formed by acid mist corrosion; electrolyte leakage occurs due to inadequate sealing of the sealing rings; oxidation edges are caused by high workshop temperature and humidity, long foil winding time, and long storage time; and surface oxidation and discoloration are caused by low cathode roller surface temperature, large amounts of air adhering to the surface that are not removed, low electrolyte temperature, and high workshop temperature and humidity. All of these can lead to color difference in copper foil.

[0005] The appearance of color difference in copper foil indicates that its finest crystalline layer has been damaged. Even if the oxide layer can be washed away and surface anti-oxidation treatment is performed, the surface smoothness is difficult to restore to its original state. Severe color difference problems can affect the film bonding quality of circuit boards, significantly increase the lateral etching of circuits, and thus negatively impact the performance and quality of related electronic products. Currently, there is still a significant need for methods and technologies to effectively solve the color difference problem of electrolytic copper foil. Therefore, those skilled in the art have provided an apparatus for solving the color difference problem that occurs during the production of electrolytic copper foil, in order to address the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a device that solves the color difference problem in the production process of electrolytic copper foil. This device ensures that the anti-oxidation solution is uniformly plated on the foil surface, thereby ensuring no color difference caused by anti-oxidation.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An apparatus for solving color difference in the production process of electrolytic copper foil includes an anti-oxidation tank, a squeezing roller, and an inlet roller, two submerged rollers, an outlet roller, and a winding roller arranged sequentially along the transmission direction of the copper foil. The height of the inlet roller is higher than the height of the two submerged rollers, the outlet roller, and the winding roller. The squeezing roller cooperates with one of the two submerged rollers closest to the outlet roller and squeezes the copper foil on the submerged roller. Two air knives are fixedly arranged between the outlet roller and the submerged roller located at the lower end of the outlet roller, and the air outlets of the two air knives are opposite to each other and located on both sides of the copper foil.

[0009] Heating rods are installed on both sides of the bottom surface inside the anti-oxidation tank, and magnetic anti-corrosion stirrers are installed at the four corners and near the center of the bottom surface inside the anti-oxidation tank.

[0010] Furthermore, an upper liquid pipe is provided on one side of the anti-oxidation tank, and a lower liquid pipe is provided on the other side of the anti-oxidation tank.

[0011] Furthermore, the end of the liquid supply pipe furthest from the anti-oxidation tank is connected to a liquid supply tank, and the end of the liquid return pipe furthest from the anti-oxidation tank is connected to a liquid return tank.

[0012] Furthermore, the return tank and the upper tank are connected by a conduit.

[0013] Furthermore, a pump body is connected to one end of the liquid supply pipe near the liquid supply tank, and the pump body pumps the liquid in the liquid supply tank into the anti-oxidation tank.

[0014] Furthermore, the two submerged rollers are respectively embedded in both sides of the anti-oxidation tank, and the two submerged rollers are arranged in a horizontal direction.

[0015] Furthermore, the air outlet temperature of the air knife is 50°C, and the heating temperature of the two heating rods is 25°C.

[0016] This utility model has the following beneficial effects:

[0017] This invention proposes a device to solve the color difference problem in the production process of electrolytic copper foil. During the collection process, the electrolytic copper foil passes through an anti-oxidation tank and is then dried by blowing hot air at about 50 degrees Celsius through an air knife to achieve the purpose of anti-oxidation. By setting five magnetic anti-corrosion stirrers and heating rods in the tank, the solution in the tank is ensured to be stirred evenly at all times. The heating rods ensure that the liquid temperature in the tank is uniform and consistent, which can ensure that the anti-oxidation solution is evenly coated on the foil surface, thereby ensuring no color difference caused by anti-oxidation. Attached Figure Description

[0018] Figure 1 This is a side view of the structure of this utility model;

[0019] Figure 2 This is a top view of the anti-oxidation tank of this utility model.

[0020] Legend:

[0021] 1. Liquid inlet tank; 2. Liquid inlet pipe; 3. Anti-oxidation tank; 4. Inlet roller; 5. Submerged roller; 6. Outlet roller; 7. Air knife; 8. Squeezing roller; 9. Rewinding roller; 10. Return pipe; 11. Return tank; 12. Guide tube; 13. Heating rod; 14. Magnetic anti-corrosion stirrer. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figures 1-2 This utility model provides an embodiment of a device for solving color difference in the production process of electrolytic copper foil, including an anti-oxidation tank 3, a squeezing roller 8, and an inlet roller 4, two submerged rollers 5, an outlet roller 6, and a winding roller 9 arranged sequentially along the transmission direction of the copper foil. The height of the inlet roller 4 is higher than the height of the two submerged rollers 5, the outlet roller 6, and the winding roller 9. The squeezing roller 8 cooperates with one of the two submerged rollers 5 closest to the outlet roller 6 and squeezes the copper foil on the submerged roller 5. Two air knives 7 are fixedly arranged between the outlet roller 6 and the submerged roller 5 located at the lower end of the outlet roller 6, and the air outlets of the two air knives 7 are opposite to each other and located on both sides of the copper foil. By setting two horizontal submerged rollers 5 inside the anti-oxidation tank 3, the copper foil is evenly contacted with the water during its movement inside the anti-oxidation tank 3, keeping it in a moist state. This can reduce the abnormal appearance of watermarks caused by local drying of the copper foil during operation and improve the appearance quality of the copper foil.

[0024] Heating rods 13 are installed on both sides of the bottom surface inside the anti-oxidation tank 3. Magnetic anti-corrosion stirrers 14 are installed at the four corners and near the center of the bottom surface inside the anti-oxidation tank 3. Five magnetic anti-corrosion stirrers 14 and heating rods 13 are set inside the tank to ensure that the solution in the tank is stirred evenly at all times. The heating rods 13 ensure that the liquid temperature in the tank is uniform and consistent, ensuring that the anti-oxidation solution is evenly plated on the foil surface, thereby ensuring no anti-oxidation color difference.

[0025] Reference Figures 1-2 An upper liquid pipe 2 is provided on one side of the anti-oxidation tank 3, and a return liquid pipe 10 is provided on the other side of the anti-oxidation tank 3; the end of the upper liquid pipe 2 away from the anti-oxidation tank 3 is connected to an upper liquid tank 1, and the end of the return liquid pipe 10 away from the anti-oxidation tank 3 is connected to a return liquid tank 11. The return liquid tank 11 and the upper liquid tank 1 are connected by a conduit 12; a pump body is connected to the end of the upper liquid pipe 2 near the upper liquid tank 1, and the pump body pumps the liquid in the upper liquid tank 1 into the anti-oxidation tank 3.

[0026] Specifically, during the production process, the copper foil for electrolytic copper batteries needs to undergo anti-oxidation treatment and passivation solution preparation. The passivation solution contains chromate, additives, and water as the solvent, prepared in a specific ratio. The prepared anti-oxidation solution is then pumped from the upper liquid tank 1 to the anti-oxidation tank 3. During the collection process, the electrolytic copper foil passes through the anti-oxidation tank 3 and is then dried by blowing hot air at about 50 degrees Celsius through the air knife 7 to achieve the purpose of anti-oxidation.

[0027] Reference Figures 1-2 Two submersible rollers 5 are embedded in the anti-oxidation tank 3 on both sides, and the two submersible rollers 5 are arranged in a horizontal direction. The horizontally arranged submersible rollers 5 ensure that the copper foil can be in horizontal and uniform contact with the internal liquid when it moves.

[0028] Reference Figures 1-2 The air outlet temperature of the air knife 7 is 50℃, and the heating temperature of the two heating rods 13 is 25℃. The heating rods 13, which are symmetrically arranged on both sides, can achieve the heating effect of the internal liquid and ensure that the temperature is consistent.

[0029] Working principle: During use, the prepared anti-oxidation solution is pumped from the upper liquid tank 1 to the anti-oxidation tank 3 through the pump body. The copper foil of the electrolytic copper foil lithium battery passes through the inlet roller 4, two liquid submerged rollers 5, the outlet roller 6 and the winding roller 9 in sequence. During the winding process, the electrolytic copper foil passes through the anti-oxidation tank 3 and comes into contact with the liquid stored inside. Then, during the winding process, it is dried by the air knife 7 blowing hot air at about 50 degrees Celsius to achieve the purpose of anti-oxidation. Meanwhile, the squeezing roller 8 next to the liquid submerged roller 5 on the right side performs copper foil squeezing and cleaning treatment.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An apparatus for solving color difference in the production process of electrolytic copper foil, comprising an anti-oxidation tank (3), a squeezing roller (8), and an inlet roller (4), two submerged rollers (5), an outlet roller (6), and a winding roller (9) arranged sequentially along the transmission direction of the copper foil, characterized in that: The height of the inlet roller (4) is higher than the height of the two submerged rollers (5), the outlet roller (6) and the winding roller (9). The squeezing roller (8) cooperates with one of the two submerged rollers (5) that is closer to the outlet roller (6) and squeezes the copper foil on the submerged roller (5). Two air knives (7) are fixedly arranged between the outlet roller (6) and the submerged roller (5) located at the lower end of the outlet roller (6), and the air outlets of the two air knives (7) are opposite to each other and located on both sides of the copper foil. Heating rods (13) are installed on both sides of the bottom surface inside the anti-oxidation tank (3), and magnetic anti-corrosion stirrers (14) are installed at the four corners and near the center of the bottom surface inside the anti-oxidation tank (3).

2. The device for solving color difference in the production process of electrolytic copper foil according to claim 1, characterized in that: An upper liquid pipe (2) is provided on one side of the anti-oxidation tank (3), and a return liquid pipe (10) is provided on the other side of the anti-oxidation tank (3).

3. The device for solving color difference in the production process of electrolytic copper foil according to claim 2, characterized in that: The end of the liquid inlet pipe (2) away from the anti-oxidation tank (3) is connected to the liquid inlet tank (1), and the end of the liquid return pipe (10) away from the anti-oxidation tank (3) is connected to the liquid return tank (11).

4. The device for solving color difference in the production process of electrolytic copper foil according to claim 3, characterized in that: The return tank (11) and the upper tank (1) are connected by a conduit (12).

5. The apparatus for solving color difference during the production of electrolytic copper foil according to claim 2, characterized in that: The liquid supply pipe (2) is connected to a pump body at one end near the liquid supply tank (1), and the liquid in the liquid supply tank (1) is pumped into the anti-oxidation tank (3) through the pump body.

6. The apparatus for solving color difference during the production of electrolytic copper foil according to claim 1, characterized in that: The two submerged rollers (5) are respectively embedded in the two sides of the anti-oxidation tank (3), and the two submerged rollers (5) are arranged in a horizontal direction.

7. The apparatus for solving color difference in the production process of electrolytic copper foil according to claim 1, characterized in that: The air outlet temperature of the air knife (7) is 50°C, and the heating temperature of the two heating rods (13) is 25°C.

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